Ms Dati, 46, who was France's first woman justice minister in Nicolas Sarkozy's government, was speaking out after what she described as "shameful" revelations about the romantic life of the country's first lady, Miss Trierweiler, 47.
Last week it emerged that Ms Trierweiler was once the shared mistress of Francois Hollande, now France's socialist president, and minister Patrick Devedjian, a conservative.
Not only was Ms Trierweiler married at the time, but so was Mr Devedjian, and Mr Hollande was living with the mother of his four children.
Now Ms Dati, whose own colourful romantic history was frequently raised when she was justice minister between 2007 and 2009, said high-profile women involved in adulterous affairs were treated unfairly.
"I think it's shameful what's done and what's been written about Valerie Trierweiler," she told Europe 1 radio station. » | Peter Allen, Paris | Saturday, October 13, 2012
